Repay

LendingPool.sol

pragma solidity >=0.4.21 <0.7.0;

function repay(address _reserve, uint256 _amount)
    external
    onlyAmountGreaterThanZero(_amount)
{
    (, uint256 currentBorrowBalance, , , ) = dataProvider.getUserReserveData(
        _reserve,
        msg.sender
    );
    uint256 amountToReturn = 0;

    require(currentBorrowBalance > 0, "User does not have any borrow pending");
    if (_amount > currentBorrowBalance) {
        amountToReturn = _amount - currentBorrowBalance;
    }
    uint256 amountToRepay = _amount - amountToReturn;

    // update state
    core.updateStateOnRepay(_reserve, msg.sender, amountToRepay);
    // return back to user
    core.transferToUser(_reserve, msg.sender, amountToReturn);
    // transfer required amount to core
    core.transferToReserve(_reserve, msg.sender, amountToRepay);
    emit Repay(_reserve, msg.sender, amountToRepay, block.timestamp);
}